It is believed that Lake Tahoe Community College (LTCC) Intermediate Algebra students get less than 8 hours of sleep per night, on average. A survey of 22 LTCC Intermediate Algebra students generated an average of 6.15 hours with a standard deviation of 1.93 hours.
At a level of significance of 5%, is there evidence that LTCC Intermediate Algebra students get less than 8 hours of sleep per night, on average? The distribution to be used for this test is X ~